1231312442 has 16 divisors (see below), whose sum is σ = 1954368000. Its totient is φ = 580196160.

The previous prime is 1231312441. The next prime is 1231312493. The reversal of 1231312442 is 2442131321.

It is a super-2 number, since 2×1231312442² = 3032260659648006728, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1231312441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77567 + ... + 92082.

It is an arithmetic number, because the mean of its divisors is an integer number (122148000).

Almost surely, 2^1231312442 is an apocalyptic number.

1231312442 is a deficient number, since it is larger than the sum of its proper divisors (723055558).

1231312442 is a wasteful number, since it uses less digits than its factorization.

1231312442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169861.

The product of its digits is 1152, while the sum is 23.

The square root of 1231312442 is about 35090.0618694239. The cubic root of 1231312442 is about 1071.8222194650.

Adding to 1231312442 its reverse (2442131321), we get a palindrome (3673443763).

The spelling of 1231312442 in words is "one billion, two hundred thirty-one million, three hundred twelve thousand, four hundred forty-two".